Engine RPM falls switching into neutral - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

shoottothrill · 03-02-2021, 09:57 PM

Hey guys, I've got a KA S14, stock ECU, stock engine, stock most things. It is a factory auto, manual swapped, still using the stock 3D auto ecu.

What I'm finding is that when I have the clutch in 1st gear, it'll idle where I would expect, 800-900 rpm. Without moving anything else (clutch still in), and switching into neutral, the idle will fall to 500-600 rpm.

If the idle fell the opposite way, neutral to 1st, that would make a fair bit more sense to me. Is this a byproduct of having the auto ecu still in? Would swapping in a 3c manual ecu fix the issue? Anybody ever run into this issue?

Thanks for the info!

03-02-2021, 09:57 PM	#1
shoottothrill Leaky Injector Join Date: Jan 2020 Location: Arizona Age: 31 Posts: 87 Trader Rating: (1) Feedback Score: 1 reviews	Engine RPM falls switching into neutral Hey guys, I've got a KA S14, stock ECU, stock engine, stock most things. It is a factory auto, manual swapped, still using the stock 3D auto ecu. What I'm finding is that when I have the clutch in 1st gear, it'll idle where I would expect, 800-900 rpm. Without moving anything else (clutch still in), and switching into neutral, the idle will fall to 500-600 rpm. If the idle fell the opposite way, neutral to 1st, that would make a fair bit more sense to me. Is this a byproduct of having the auto ecu still in? Would swapping in a 3c manual ecu fix the issue? Anybody ever run into this issue? Thanks for the info!